No, you can not disable it globally. If you removed it globally, only the checkbox will not be shown, mailscan remains active for all accounts were it has been active before if you did not disable it in every account.

No, you can not disable it globally. If you removed it globally, only the checkbox will not be shown, mailscan remains active for all accounts were it has been active before if you did not disable it in every account.

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Isn't there another way to disable Spamassassin?! I have about 150 mail boxes on this server..

Try change spam rule, if you have discard try change it to TAG.
I dont thing spamassassin drop your mails, but if you can search your mail log for delivery information, if message is delivered to your server.